WO2014117392A1 - Appareillage de commutation à isolation solide et sa structure d'isolation à espace de gaz - Google Patents

Appareillage de commutation à isolation solide et sa structure d'isolation à espace de gaz Download PDF

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Publication number
WO2014117392A1
WO2014117392A1 PCT/CN2013/071278 CN2013071278W WO2014117392A1 WO 2014117392 A1 WO2014117392 A1 WO 2014117392A1 CN 2013071278 W CN2013071278 W CN 2013071278W WO 2014117392 A1 WO2014117392 A1 WO 2014117392A1
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WO
WIPO (PCT)
Prior art keywords
gap
gas
shielding ring
conductor
ring
Prior art date
Application number
PCT/CN2013/071278
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English (en)
Chinese (zh)
Inventor
马平
游一民
王振良
Original Assignee
厦门华电开关有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 厦门华电开关有限公司 filed Critical 厦门华电开关有限公司
Priority to PCT/CN2013/071278 priority Critical patent/WO2014117392A1/fr
Publication of WO2014117392A1 publication Critical patent/WO2014117392A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/01—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with resin casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations

Definitions

  • the present invention relates to the field of switching devices in power systems, and more particularly to a gas gap insulating structure and a solid insulated switchgear having the gas gap insulating structure.
  • the air-insulated switchgear In the medium voltage switchgear, there are mainly two kinds of switchgear used in the past.
  • One is the air-insulated switchgear.
  • the insulation distance of the air is large, so the air-insulated switchgear is also relatively large, and is subject to the surrounding environment such as air pressure. Humidity, density, dust, etc. have a great influence.
  • the other is SF6 (sulfur hexafluoride) insulated switchgear, excellent insulation of SF6 gas.
  • the performance not only can effectively reduce the size of the switchgear, the gas environment of the switchgear seals it to eliminate the influence of the external environment, especially suitable for places with harsh environmental conditions.
  • SF6 is a greenhouse gas, and applications and emissions should be minimized to protect the environment.
  • the solid insulated switchgear not only overcomes the shortcomings of air insulation and SF6 insulation, but also has a grounded metal or semiconductor coating on the outer surface, which is accessible to the human body and is not subject to electric shock. It is not affected by the external environment during operation. Due to the high dielectric constant and breakdown field strength of the solid insulating material, the structure of the solid-state switching device is more compact; in addition, the solid insulating material has a higher thermal conductivity than the gas, which makes the heat dissipation of the conductor easier, and the product technology of the switching device The parameters can be higher. Therefore, solid insulation technology is an important direction for the future development of switchgear.
  • solid insulation refers to an insulation structure in which a region of a high electric field is located inside a solid material to which the sheath is grounded.
  • solid-sealed poles in power equipment also use solid insulating materials.
  • Solid epoxy materials of solid insulating materials of conventional solid-sealed poles mainly serve as fixing and supporting.
  • the electric field strength inside the epoxy resin is very low, and the human body is running. It is not close to or touched; unlike conventional solid-sealed poles, the solid-insulation material of solid-insulated switchgear has a very high electric field strength, which gives it the advantage of high breakdown field strength.
  • the outer surface is grounded and accessible to the human body during operation. , Safe and reliable.
  • an insulating structure for a gas gap in a medium-high voltage solid insulated switchgear includes an insulating structure of a symmetrical gas gap and an insulating structure of an asymmetric gas gap.
  • the symmetrical gas gap insulation structure is used for the symmetrical gas fracture insulation of the isolating switch in the solid insulation equipment;
  • the asymmetric gas gap insulation structure is used for the circuit breaker operation end to ground insulation, the isolating switch operation end to ground insulation structure and the grounding The gas break of the switch.
  • the authorization notice number is CN202159894U (hereinafter referred to as Document 1)
  • the Chinese invention patent entitled “Indoor High Voltage Solid Insulation Disconnect Switch” discloses an indoor high-voltage solid insulation isolation switch, and the isolation switch body includes a solid-sealed base.
  • the upper and lower inlet and outlet bases embedded in the base, and the rear, middle and front conductive seats are opened and closed by a sliding fit of the conductive tube and the conductive seat.
  • the gas in the structure of the structure of Document 1 is easy to seal and has a compact structure.
  • the partial use of the shed in the insulating structure is only a simple increase of the creepage distance, and can not improve the concentration of the gas electric field in the gas chamber, especially in the solid insulated switchgear, because the outer surface of the pole is grounded, the structure of the document 1 It is difficult to solve the problem of excessive local field strength in the gas between the isolation fractures and the gas gap between the grounds in a small diameter. Therefore, there is often an accident in which the discharge is excessive and the insulation breakdown occurs.
  • the authorization publication number is CN201820692U, the Chinese invention patent entitled “Solid Insulation High Voltage Circuit Breaker Pole”, discloses a solid insulated high voltage circuit breaker pole structure, the main conductive loop is cast in epoxy resin, and the sealed connection socket is The solid insulated connection interface, the high field strength region is located inside the epoxy chamber between the arc extinguishing chamber and the connecting conductors at both ends and the grounding sheath. Since the insulating tie rod is disposed in the opening of the movable end effector, the insulation of the air gap in the opening of the movable end effector becomes a weak link of the entire structure.
  • the air in the opening of the movable end effector is separated from the external ambient air by the silicone rubber sealing sleeve, the external environment is not affected by the adverse external environment, and the ground insulation in the opening of the movable end effector is affected;
  • the pressing member is intended to improve the insulation level of the moving end, but since the outer surface of the pole is grounded differently from the conventional solid-sealed pole, the setting of the pressure-regulating member cannot effectively improve the moving-end operating member due to a significant change in the voltage boundary thereof. In the case where the electric field in the gas in the opening is concentrated, the closed gas environment is still unable to avoid the discharge in the gas.
  • the Chinese invention patent entitled "Solid Separation Switch and Solid Insulated Switchgear Using It” is disclosed in CN101090041A, which discloses a solid isolation switch, and the insulating connecting portion for the opening and closing operation is surrounded by a solid insulating material.
  • the opening and closing operations are performed by a movable contactor.
  • An insulating spacer is arranged between the chassis and the fixed contactor to ensure electrical insulation to the ground.
  • the prior art solid insulated switchgear cannot solve the problem of electric field concentration in the gas gap insulation structure. Due to the influence of the grounding of the outer surface of the solid insulated switchgear, the electric field concentration problem of such a gas gap insulating structure cannot solve the problem by increasing the gap distance of the fracture gas. Therefore, there is a need for a solid insulated switchgear to overcome the drawbacks of current solid insulated switchgear equipment that often suffer from partial discharge and insulation breakdown accidents during operation. Summary of the invention
  • an object of the present invention is to provide a gas gap insulation structure to solve In the current solid insulated switchgear, the technical problems of partial discharge and insulation breakdown accidents often occur in operation, thereby solving the problem of electric field concentration in the gas gap of the solid insulation structure.
  • Another object of the present invention is to provide a solid insulated switchgear having the gas gap insulating structure.
  • the technical solution of the present invention is as follows:
  • a gas gap insulation structure for a solid insulated switchgear comprising: a solid insulation casing having a ground layer; a gas in the solid insulation casing and a first conductor insulated by the gas and a second shielding ring; a second shielding ring disposed in the solid insulating housing itself; a third shielding ring; and a first shielding ring as a floating potential, the second shielding ring connecting the first conductor, the third a shielding ring is connected to the second conductor, the first shielding ring is disposed inside the second shielding ring and the third shielding ring; wherein, between the first shielding ring and the second shielding ring The minimum gap is the second gap, the minimum gap between the first shielding ring and the third shielding ring is a third gap, and the minimum gap between the second shielding ring and the third shielding ring is a gap; the first gap is greater than the second gap and the third gap, and a sum of the second gap and the third gap is greater
  • a gas gap insulation structure for a solid insulated switchgear comprising: a solid insulation casing having a ground layer; a gas in the solid insulation casing and a first conductor insulated by the gas and a ground potential conductor; a first shielding ring and a second shielding ring disposed in the solid insulating housing itself; the first shielding ring as a floating potential has an inclined portion and a first parallel portion, the first parallel portion and The inclined portions have an angle therebetween, the second shielding ring is connected to the first conductor, the second shielding ring has a second parallel portion, and the first parallel portion is disposed at the second parallel portion The inner side; wherein a minimum gap between the first shielding ring and the ground layer is a first gap, and a minimum gap between the first shielding ring and the second shielding ring is a second gap.
  • the solid insulated switchgear of the present invention has the gas gap insulating structure of the present invention.
  • the gas gap insulating structure of the present invention optimizes the design of the gas gap insulating structure in the solid insulating structure.
  • the shielding structure By embedding the shielding structure in the solid insulating material, the advantage of the high breakdown field strength of the solid insulating material is exerted; by providing a floating potential shielding ring acting as an intermediate shielding between the shielding ring and the gas, the solid insulating structure is The gas fracture field strength distribution is more uniform and does not exceed the gas breakdown field strength, forming an effective transition between the solid insulation small insulation gap and the gas insulation large insulation gap.
  • Reasonable design allows the overall equipment size to be reduced, the equipment to be more compact and more reliable.
  • FIG. 1A is a schematic view showing a gas gap insulation structure according to a first embodiment of the present invention.
  • Figure 1B is a detailed cross-sectional view of the shield ring of Figure 1A.
  • Figure 1C is a dimensional annotation of Figure 1A.
  • 1D is a schematic view of a shield ring and a mesh thereof in a gas gap insulation structure according to an embodiment of the present invention.
  • Fig. 1E is a 1/4 cross-sectional view showing a floating potential shield ring in a gas gap insulating structure according to a first embodiment of the present invention.
  • 2A and 2B are schematic views of a gas gap insulating structure for a three-position switch according to a first embodiment of the present invention.
  • 3 is a schematic view of a gas gap insulation structure for a circuit breaker pole according to a first embodiment of the present invention.
  • FIG. 4A is a schematic view showing a gas gap insulation structure according to a second embodiment of the present invention.
  • Figure 4B is a detailed cross-sectional view of the shield ring of Figure 4A.
  • Figure 4C is a dimensional annotation of Figure 4A.
  • Fig. 5 is a schematic view showing a gas gap insulating structure for a three-position switch according to a second embodiment of the present invention.
  • Fig. 6 is a schematic view showing a gas gap insulating structure for a pole of a circuit breaker according to a second embodiment of the present invention. detailed description
  • the solid insulated switchgear of the present invention has the gas gap insulating structure of the embodiment of the present invention.
  • the idea of the gas gap insulation structure of the first embodiment of the present invention is that in the direction of the voltage gradient of the symmetrical gas gap, the field strength of the gas near the interface between the solid and the gas can be uniformly distributed at a level not exceeding the breakdown field strength thereof, thereby Minimizing the length of the gas fracture makes the entire insulation structure more compact, taking advantage of solid insulation technology.
  • the solid insulated switchgear of the present invention is mainly a medium and high voltage solid insulated switchgear.
  • the gas gap insulating structure of the first embodiment of the present invention comprises: a solid insulating housing 1 (hereinafter referred to as housing 1), a conductor 2, a conductor 3 and a gas 4, and the conductor 2 and the conductor 3 are respectively located in the gas.
  • the casing 1 On both sides of the casing 4, the casing 1 includes a grounding layer 5 and a shielding ring 102 and a shielding ring 103 formed in the casing 1 itself, and particularly includes a shielding ring 101 formed in the casing 1 itself as a floating potential. Also referred to as a floating potential shield ring 101.
  • the floating potential shield ring 101 is inside the shield ring 102 and the shield ring 103.
  • the gas gap insulation structure of the embodiment is applicable to the isolation switch fracture in the solid insulation equipment, that is, the symmetric gas gap insulation structure; and is also applicable to the insulation of the operation end of the circuit breaker, the insulation of the operation end of the isolation switch, the ground insulation, and the grounding switch. Gas fracture, that is, asymmetric gas gap insulation structure.
  • the conductor 2 and the conductor 3 form a fixed conductive connection with the shield ring 102 and the shield ring 103, respectively.
  • Conductor 2 conductor 3 According to different operating conditions, there are two possibilities of charging and grounding. When conductor 2 and conductor 3 are both charged, their ground voltage may be different.
  • a strong electric field region is formed between the conductor 2 and the conductor 3 and the ground layer 5; a solid insulation fracture is formed between the shield ring 102 and the shield ring 103, and the high field strength is limited to the ground layer 5.
  • the area between the shield ring 102 and the shield ring 103 effectively controls the problem that the field strength near the junction A of the conductor 2, the conductor 3 and the three dielectrics of the casing 1 and the gas 4 exceeds the gas 4 tolerance level, and the joint thereof Insulation failure and partial discharge caused by casting defects in partial production.
  • the arrangement of the floating potential shielding ring 101 makes the distribution of the field strength of the gas 4 on the inner surface of the casing 1 and its two dielectric interfaces B more uniform, effectively avoiding the problem that the local field strength of the interface exceeds the tolerance level of the gas 4, thereby making the conductor
  • the gas 4 between the 2 and the conductor 3 has the smallest fracture length.
  • the casing 1 is usually cast from a solid insulating material such as epoxy resin, and the outer surface of the casing 1 is provided with a ground layer 5.
  • the housing 1 can also be made of other new insulating materials.
  • the shielding ring 101, the shielding ring 102, and the shielding ring 103 are made of a conductive material, and generally have a temperature coefficient close to that of the material of the casing 1, such as aluminum or aluminum alloy.
  • the shield ring 102 includes a bent portion 1021, a parallel portion 1022, and a connecting portion 1023.
  • the parallel portion 1022 is parallel to the axis m of the entire gas gap insulating structure, and the connecting portion 1023 is used to connect the conductor 2
  • the bent portion 1021 is disposed to prevent discharge.
  • the shield ring 103 also includes a bent portion 1031, a parallel portion 1032, and a connecting portion 1033 which are parallel to the axis m of the entire gas gap insulating structure, and the connecting portion 1033 is used to connect the conductor 3.
  • connections 1023, 1033 may be omitted, with the parallel portions 1032 directly grounded or 1023 connected to a conductor, such as the left end of the shield ring 108 of Figure 2A.
  • the shield ring 101 includes parallel portions 1011 and bent portions 1012, 1013 at both ends of the parallel portion 1011.
  • the bent portion 1012 is opposite to the bent portion 1021, and the bending direction is opposite, and the bent portion 1013 is opposed to the bent portion 1031, and the bending direction is opposite.
  • each of the bent portions has the same bent shape, and is preferably a circular arc shape and has a circular arc shape having the same radius of curvature.
  • Figure 1C is an annotated view of the key dimensions of Figure 1A.
  • the distance rl between the parallel portion 1032 of the shield ring 103 and the axis m, and the shield ring 102 The distance r2 between the parallel portion 1022 and the axis m should be greater than the distance r3 between the parallel portion 1011 of the shield ring 101 and the axis m and smaller than the distance r4 between the ground layer 5 and the axis m, that is, the shield ring 102 and the shield ring 103 should be at the floating potential.
  • the minimum length dl, d2 of the shield ring 103 and the shield ring 102 respectively formed with the floating potential shield ring 101 should be less than the length d3 of the minimum gap between the shield ring 102 and the shield ring 103, while the axial length d4 of the floating potential shield ring 101 should be greater than the length of the minimum gap between the shield ring 102 and the shield ring 103.
  • D3, and the length d1 + length d2 is greater than or equal to the length d3.
  • the axial length d4 of the shield ring 101 is about 0.3-0.4 times the length d5 of the gas 4 between the conductor 2 and the conductor 3.
  • a minimum gap between the shield ring 101 and the shield ring 102 is formed between the bent portion 1012 and the parallel portion 1022, and the shield ring 101 is
  • the minimum gap of the shielding ring 103 is formed between the bent portion 1013 and the parallel portion 1032 to reduce the radial length r5 of the casing 1 itself, and at the same time, the purpose of reducing the fracture length d5 to achieve the gas gap insulation of the present invention.
  • the floating potential shielding ring 101, the shielding ring 102, the shielding ring 103, and the shielding ring 108 can be punched with a mesh at a position where the working field strength is small.
  • the shielding ring 108 As an example, as shown in FIG. 1D, the shielding ring 108 has The parallel portion 1081 and the bent portion 1082 are punched with a mesh hole 1080 in the parallel portion 1081.
  • the epoxy resin can connect the epoxy on both sides of the mesh 1080 through the mesh 1080 to improve the shielding ring 101, 102, 103, 108 and the material of the insulating housing 1 (for example, epoxy resin). The strength of the bond.
  • the center of the floating potential shield ring 101 also has a projection 1014 as shown in Fig. 1E.
  • the floating potential shield ring 109 of the gas gap insulating structure of the second embodiment of the present invention also has the same function of the projections 1095.
  • FIG. 2A and FIG. 2B are schematic diagrams showing an embodiment of a three-position switch for a solid insulated isolation ground of a gas gap insulation structure according to a first embodiment of the present invention, the three position switch having an intermediate contact 2' and an isolation contact 3 ', the movable contact 6, the insulating operating rod 7 and the grounding contact 8, and the gas gap insulating structure of the present embodiment includes the gas between the housing 1, the movable contact 6 and the isolated contact 3' having the ground layer 5.
  • An isolation fracture is formed between the intermediate contact 2' and the isolated contact 3'.
  • the middle contact 2' and the isolated contact 3' have both charging and grounding possibilities.
  • the voltage to the ground may be different. Therefore, the type of fracture in the three-position switch of the present embodiment is a symmetric gas gap insulation structure.
  • the type of the fracture in the three-position switch of the embodiment is an asymmetric gas gap insulation structure.
  • the isolating switch in the three position switch is in the open state.
  • the shield ring 102, the shield ring 103, and the shield ring 101 of the gas gap insulating structure of the first embodiment of the present invention are disposed such that the gas field 4 in the isolation fracture region is more evenly distributed along the surface of the insulating casing inner surface.
  • the grounding switch in the three-position switch is in an open state.
  • the shielding ring 102, the shielding ring 108 and the floating potential shielding ring 109 of the gas gap insulating structure of the first embodiment of the present invention can also be arranged such that the gas 9 of the intermediate contact 2' insulating gap is grounded on the inner surface of the insulating material. The strong distribution is more uniform.
  • the insulating operating rod 7 is disposed in the grounding fracture, and since the axial direction of the insulating operating rod 7 is consistent with the direction of the voltage gradient of the gas gap to the ground, the electric field distribution of the surrounding gas is generally not adversely affected. The impact can be ignored.
  • the gas gap insulating structure of the first embodiment of the present invention comprises a housing 1 having a ground layer 5, a gas 9 and shielding rings 102, 108, 109, wherein the shielding ring 109 is a floating potential shielding ring.
  • the gas gap insulation of the present invention The structure can well solve the problem of excessive field strength of the gas near the interface B between the inner surface of the casing 1 and the gas 4 when the circuit breaker is opened and closed, without complicating the structure of the operating rod portion.
  • the gas gap insulating structure of the first embodiment described above, in the application of FIG. 2B and FIG. 3, can be more optimized and simpler in structure according to the idea of the gas gap insulating structure of the first embodiment shown in FIG.
  • the shielding structure of the asymmetric gas gap insulating structure is the gas gap insulating structure of the second embodiment of the present invention.
  • the insulating structure of the gas gap of the second embodiment of the present invention used in the solid insulated switchgear includes: a casing 1 having a ground layer, a conductor 2, a ground potential conductor 8, a gas 9, and a shield Rings 102, 109, wherein shield ring 109 is a floating potential shield ring.
  • the shield ring 102 has a connecting portion 1023, a horizontal portion 1022, and a bent portion 1021
  • the shield ring 109 has a bent portion 1093, a horizontal portion 1091, an inclined portion 1092, and a bent portion 1094, and the conductor 2 and
  • the connecting portion 1023 of the shielding ring 102 forms a fixed conductive connection
  • the shielding ring 109 is embedded in the housing 1 as a floating potential.
  • the horizontal portion 1091 of the shielding ring 109 is located inside the horizontal portion 1022 of the shielding ring 102, and the inclined portion 1092 is bent toward the vicinity.
  • the direction of the portion 1021 is inclined, and the angle between the horizontal portion 1091 and the inclined portion 1092 is, for example, 45 to 150 degrees, preferably 120 degrees.
  • Conductor 2 has two possibilities of charging and grounding according to different operating conditions. Due to the arrangement of the ground layer 5, a strong electric field region is formed between the conductor 2 and the ground layer 5; and due to the arrangement of the inner shield ring 102, an end-to-ground shield structure is formed in the casing 1, and the high field strength is limited to the ground.
  • the area between the layer 5 and the shield ring 102 effectively controls the problem that the field strength near the junction A of the conductor 2 and the casing 3 and the gas 3 exceeds the gas 4 tolerance level, and the casting of the joint surface is locally produced. Insulation faults and partial discharge problems caused by defects.
  • the arrangement of the floating potential shielding ring 109 makes the field intensity distribution of the dielectric interface B of the casing 1 and the gas 9 more uniform, effectively avoiding the problem that the local field strength of the interface exceeds the tolerance level of the gas 4, thereby making the conductor 2 and the ground
  • the gas 9 between the potential conductors 8 has the smallest fracture length.
  • the distance r2 between the parallel portion 1022 of the shield ring 102 and the axis m should be greater than the distance r3 between the parallel portion 1091 of the shield ring 109 and the axis m and smaller than the ground layer 5 and the axis m.
  • the length d2 of the gap formed by the ring 102 and the floating potential shielding ring 109 is on the side of the floating potential shielding ring 109 close to the ground potential conductor 8, the shielding ring 109 is bent toward the ground layer 5, and the length between the shielding ring 109 and the ground layer 5 is formed.
  • the minimum gap of d6 (which is also the shortest distance between shield ring 109 and ground plane 5).
  • the length d2 is equal to the length d6. Also, the length d6 is smaller than the radial distance between the parallel portion 1022 and the ground layer 5.
  • each of the bent portions has the same bent shape, and is preferably a circular arc shape and has a circular arc shape having the same radius of curvature.
  • the gas gap insulating structure of the second embodiment of the present invention can be used for a three-position switch, as shown in Fig. 5, in Fig. 5, the grounding switch of the three-position switch is in an open state.
  • the shielding ring 102 and the floating potential shielding ring 109 are also arranged such that the gas field 9 of the intermediate contact 2' to the ground insulating gap has a more uniform field strength distribution on the inner surface of the insulating material.
  • the gas gap insulation structure of the second embodiment of the present invention can also be used for a circuit breaker pole.
  • the structure of the circuit breaker itself is the same as that shown in FIG. 3.
  • the gas gap insulation structure of the second embodiment of the present invention is shown.
  • a strong electric field region is formed between the conductor of different potentials and the conductor and the ground layer 5 due to the arrangement of the ground layer 5; a solid insulation fracture is provided inside the casing 1 to set a high field strength
  • the area is limited to the area between the ground layer 5 and the high potential shielding ring, effectively controlling the high potential conductor and the casing 1 and the gas 4
  • the arrangement of the floating potential shielding rings 101, 109 makes the field strength of the gas 4 near the interface between the inner surface of the casing 1 and the gas medium more uniform, effectively avoiding the problem that the local field strength near the interface exceeds the gas tolerance level, making the difference
  • the length of the gas fracture between the conductors of the potential is the smallest.
  • the purpose of reducing the radial dimension of the casing 1 and further reducing the axial length of the gas port can be achieved by adjusting the formation position of the minimum gap, so that the structure is more compact and miniaturized.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

La présente invention concerne un appareillage de commutation à isolation solide et sa structure d'isolation à espace de gaz. La structure d'isolation à espace de gaz comprend : un boîtier à isolation solide pourvu d'une couche de mise à la terre ; un gaz dans le boîtier à isolation solide et un premier conducteur et un second conducteur isolés par le gaz ; un deuxième anneau de protection, un troisième anneau de protection et un premier anneau de protection servant de potentiel flottant, lesquels sont disposés dans le boîtier à isolation solide. Le deuxième anneau de protection est connecté au premier conducteur, le troisième anneau de protection est connecté au second conducteur et le premier anneau de protection est disposé sur les côtés intérieurs du deuxième anneau de protection et du troisième anneau de protection. L'espace minimal entre le premier anneau de protection et le deuxième anneau de protection est un deuxième espace, l'espace minimal entre le premier anneau de protection et le troisième anneau de protection est un troisième espace et l'espace minimal entre le deuxième anneau de protection et le troisième anneau de protection est un premier espace. Le premier espace est plus grand que le deuxième espace et que le troisième espace, et la somme du deuxième espace et du troisième espace est supérieure au premier espace. L'adoption de la structure d'isolation à espace de gaz divulguée par la présente invention permet de résoudre le problème de la concentration de champ électrique dans un espace de gaz d'une structure à isolation solide.
PCT/CN2013/071278 2013-02-01 2013-02-01 Appareillage de commutation à isolation solide et sa structure d'isolation à espace de gaz WO2014117392A1 (fr)

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CN104465213A (zh) * 2014-12-03 2015-03-25 中国西电电气股份有限公司 气体绝缘开关设备及其压气式负荷开关灭弧室
CN108807068A (zh) * 2017-04-26 2018-11-13 伊顿电力设备有限公司 一种固体绝缘筒

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CN108807068A (zh) * 2017-04-26 2018-11-13 伊顿电力设备有限公司 一种固体绝缘筒
CN108807068B (zh) * 2017-04-26 2022-11-04 伊顿电力设备有限公司 一种固体绝缘筒

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